linux-kernel - Re: [PATCH 0/2] vsprintf: ignore %n again

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Message-ID: <20130918141104.GT19256@mwanda>
Date:	Wed, 18 Sep 2013 17:11:04 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	keescook@...omium.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, joe@...ches.com, linux@...izon.com,
	JBeulich@...e.com, kosaki.motohiro@...il.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 0/2] vsprintf: ignore %n again

Sure.  There are a lot of non-const strings though.

diff --git a/include/linux/printk.h b/include/linux/printk.h
index e6131a78..317587b 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -122,6 +122,11 @@ asmlinkage int printk_emit(int facility, int level,
 
 asmlinkage __printf(1, 2) __cold
 int printk(const char *fmt, ...);
+#define printk(fmt, ...) do {				  \
+	compiletime_assert(__builtin_constant_p(fmt),     \
+			   "Non-constant format string"); \
+	printk(fmt, ##__VA_ARGS__);			  \
+} while (0)
 
 /*
  * Special printk facility for scheduler use only, _DO_NOT_USE_ !
--
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